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Influence of High-performance Synchronous Grouting Material on Shield
Construction Parameters in Water-rich Sand Layer
(1 School of Engineering (Wuhan), China University of Geosciences, Wuhan 430074; 2 China Academy of Building Research Co., Ltd., Beijing 100013; 3 JSTI Group Co., Ltd., Nanjing 210000; 4 Nantong Urban Rail Transit Co., Ltd., Nantong 226000)
Abstract A high-performance shield grouting material suitable for water-rich sand layer is prepared on the basis
of the engineering background of Nantong Rail Transit Line 1 in water-rich sand layer. Then, comparative study is performed for the grouting performances of the prepared high-performance grouting material and existing grout used on the site as well as their influence law on shield construction parameters. The results show that: compared with the lot section used with existing grouts, the shield machine in the test section used with high-performance synchronous grouting material has the following properties: the soil chamber pressure increases from 0.22 MPa to 0.25 MPa, the average thrust increases from 12 000 kN to 15 000 kN, the cutter head torque increases from 1 150 kN·m to 1 450kN·m, the grouting amount decreases from 5.7 m3 to 5.2 m3 and the surface settlement is only 8.15 mm, so that the material cost is significantly reduced and the surface settlement could be effectively controlled. Furthermore, the relationship among key construction parameters of the shield is analyzed to find that the continuous reduction of grouting volume might have a certain impact on the soil chamber pressure, thrust and torque of the shield machine; when the shield machine drives at a constant speed, the variation laws of the curves of the soil chamber pressure, shield
thrust and torque are consistent.
Abstract：
A high-performance shield grouting material suitable for water-rich sand layer is prepared on the basis
of the engineering background of Nantong Rail Transit Line 1 in water-rich sand layer. Then, comparative study is performed for the grouting performances of the prepared high-performance grouting material and existing grout used on the site as well as their influence law on shield construction parameters. The results show that: compared with the lot section used with existing grouts, the shield machine in the test section used with high-performance synchronous grouting material has the following properties: the soil chamber pressure increases from 0.22 MPa to 0.25 MPa, the average thrust increases from 12 000 kN to 15 000 kN, the cutter head torque increases from 1 150 kN·m to 1 450kN·m, the grouting amount decreases from 5.7 m3 to 5.2 m3 and the surface settlement is only 8.15 mm, so that the material cost is significantly reduced and the surface settlement could be effectively controlled. Furthermore, the relationship among key construction parameters of the shield is analyzed to find that the continuous reduction of grouting volume might have a certain impact on the soil chamber pressure, thrust and torque of the shield machine; when the shield machine drives at a constant speed, the variation laws of the curves of the soil chamber pressure, shield
thrust and torque are consistent.
GAO Pengpeng1 XU Fang1 SONG Putao2 WANG Ningning3 ZHANG Wei4
.Influence of High-performance Synchronous Grouting Material on Shield
Construction Parameters in Water-rich Sand Layer[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(6): 244-250
2021, Vol. 58 